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Mazda 5 Speed Gearbox oil change


CtrMint

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Hey All,, 

I've been doing plenty of background reading regarding a gearbox oil change on my 420R.  There isn't a huge amount of info out there.  I have however come across information on old forum posts inc Pistonheads which says the Mazda 5 speed doesn't have a drain plug, and also there's a bolt near the fill plug which must not be removed, and if removed the box needs a rebuild as it holds some internal parts. eek!

Given the uncertainty and since the box doesn't really need an oil change, I'm starting to become slightly less enthusiast.  I'm simply trying to be super proactive changing every serviceable item while undertaking my diff project.  But as they say, 'if it aint broke', and knowing my luck I'll create a new problem for myself!

If any of the regular experts could offer advice I'd appreciate it. 

I thought it would be as simple as drop oil via an obvious drain plug, then refill same amount, via obvious fill plug.  The only challenge being the fill plug access, but that's usual Caterham life.

thanks in advance

Cheers

Mark

 

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My 420 with the Mazda 5 speed certainly has a drain plug as normal.

Also, you cant really go wrong when filling it, as there is an access hole with a grommet in the offside of the transmission tunnel and when you remove that, the fill plug is right behind it.

Andy

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I've been into Vitesse when they happened to be building mazda boxes for caterham. I can confirm they have a caterham specific mid case and bellhousing. The replacement bellhousing is to adjust the angle the box presents to the engine as the engine cant is different between the MX5 and seven.

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Hi, 

Have a mx5 (NC 3.5 to be anal) along with a 150 Seven. Yup, the 5 speed box is drained on a regular basis - recommended about every 5 years or 60k miles - most do it sooner to maintain the change. The turret is also a regular check and may need a top up as it leaks into the box over the years, can't top up a 5 spd through it. Lots of info on the plugs on line. It's another car that attracts the self maintaining. 

Andy

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  • 2 years later...

Just a little info to add, I’ve just changed the gear oil in my 2018 420R and replaced the drain plug with a magnetic Gold Plug M18 x 1.5 number MP-10. The std plug did have a magnetic but the Gold Plug is significantly stronger.

The filler plug was a little corroded so I also replaced this with a Jass Performance stainless version 

https://www.ebay.co.uk/itm/196026719273?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=s6LgY7zoS-W&sssrc=4429486&ssuid=7rWpRUJiSXS&var=&widget_ver=artemis&media=COPY

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